Retractable running board

ABSTRACT

A retractable running board assembly is mounted to the frame of a vehicle. The running board is selectively extendable between a retracted position, which is close to the vehicle&#39;s frame, and a lower, laterally-outward extended position that facilitates easy entrance into and exit from the vehicle. A plurality of longitudinally spaced, selectively-actuated links connect the running board to the frame. A selectively-operable driving mechanism concertedly actuates each of the links to extend and retract the running board. When the driving mechanism is not operated, each link resists actuation and holds the running board in a fixed position relative to the frame.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of priority to U.S. ProvisionalPatent Application No. 60/348,389 titled “Retractable Running Board,”filed on Jan. 16, 2002, which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to retractable running boards forvehicles.

2. Description of Related Art

Most conventional vehicle running boards have fixed positions relativeto the frames of the vehicles that they are attached to.

Designers of fixed-position running board vehicles must balance groundclearance against the desire to place running boards in a lower, morepassenger convenient position midway between ground level and the loweredge of the vehicle door opening. In a vehicle such as a truck, in whicha large ground clearance is advantageous, the cab and passenger seatsare typically disposed well above ground level. Consequently,conventional running boards provide an intermediate step for passengersto use to enter and exit the vehicle. From the standpoint offacilitating a passenger's entrance and exit from the vehicle, the mostconvenient height for a running board is generally at about half thedistance between the ground level and the lower edge of the vehicle dooropening. However, disposing the running board at such a low positionreduces the vehicle's ground clearance. Consequently, designers mustsacrifice either convenience or ground clearance when determining theheight of a fixed-position running board.

Conventional retractable running boards, such as the running boarddisclosed in U.S. Pat. No. 5,697,626, include running boards withselectively variable heights. When the vehicle is being driven, therunning board is raised vertically to improve the vehicle's groundclearance. Conversely, when the vehicle is stopped, the running boardcan be lowered to position the running board at a more convenient heightfor the passengers.

Vehicle designers face an additional dilemma when determining thelateral position of fixed-position running boards. To provide the mostconvenience to passengers entering or exiting a vehicle, the runningboard should be disposed laterally outwardly from the vehicle'sentrances/doors such that the lower edge of the door opening, therunning board, and the ground form laterally- and vertically-spacedsteps like those in building stairways. Unfortunately, disposing arunning board fixed laterally outwardly from the vehicle for thepassengers' convenience disadvantageously increases the vehicle's width.

Conventional retractable running boards, such as the running boarddisclosed in U.S. Pat. No. 3,608,957, have been designed to extendlaterally outwardly when the vehicle's door is opened such that therunning board is in a convenient laterally-outward position when thepassengers need to use it to enter and exit the vehicle. Conversely, therunning board is retracted laterally inwardly when the door is closed sothat the vehicle has a narrower width during operation.

The Applicants are aware of a retractable running board developed by AmpResearch of Irvine, Calif. that moves both laterally and verticallybetween its extended and retracted positions; however, they have not hadan opportunity to examine that device, nor are they aware of any patentsdisclosing that device. The Applicants believe that two longitudinallyspaced four-bar linkages connect the running board to the vehicle, andthat an automatic actuator powers only one of the two linkages to extendthe running board downwardly and outwardly when the vehicle's passengerdoor is opened. The second four-bar linkage is believed to move freelyand therefore follows the movements of the first powered linkage as thepowered movement of the first linkage is transferred through the lengthof the running board to the second linkage. Because the second linkageis not, itself, powered and cannot resist movement of the running board,the running board cannot be firmly held in place, especially when theweight of a passenger is exerted on the running board at a position farfrom the first powered linkage.

The statements made herein with respect to the Amp Research device areonly made for the purposes of disclosing potentially relevantinformation to the Examiner. As the Amp Research device was only seen ata tradeshow prior to the effective filing date of this application by anemployee of the assignee and could not be closely examined, Applicantsbelieve that the device functions as stated above and for the purposesof examining the present application, the Examiner may consider this tobe the case. However, Applicants reserve the right to dispute theseissues in the event further information becomes available.

SUMMARY OF THE INVENTION

One aspect of the present invention provides a retractable running boardassembly for use with a vehicle having a passenger compartment and anopening for permitting a person to enter and exit the passengercompartment. The retractable running board assembly includes an anchorconstructed and arranged to mount the running board assembly to thevehicle in an operative position beneath the passenger compartment. Theretractable running board assembly also includes a elongated retractablerunning board and a running board moving assembly. The running boardmoving assembly includes at least first and second selectively-actuatedlinks connected to the anchor and movably supporting the running boardat longitudinally spaced apart positions. The links are constructed andarranged such that, when the running board assembly is mounted in theoperative position, concerted actuation of each of theselectively-actuated links moves the running board between (a) anextended position wherein the running board is extended outwardly fromthe vehicle away from the door opening at an elevation lower than thedoor opening and spaced above ground level for facilitating entry intothe passenger compartment via the door opening and (b) a retractedposition wherein the running board is retracted inwardly and raisedupwardly from the extended position. The running board moving assemblyfurther includes a selectively-operable driving mechanism operativelyconnected to each of the first and second selectively-actuated linkssuch that, when the running board assembly is mounted in the operativeposition, selective operation of the driving mechanism concertedlyactuates each of the selectively-actuated links to move the runningboard between the retracted and extended positions.

The running board moving assembly may further include an elongatedtorque transmitting member operatively connecting each of the secondlegs of the first and second selectively-actuated links to theselectively-operable driving mechanism to transmit torque from theselectively-operable driving mechanism to pivot the second legs about alongitudinal axis, thus causing the links to move the running boardbetween the extended and retracted positions.

The running board moving assembly may include a backdrive-preventionmechanism operatively connected between the selectively-operable drivingmechanism and the selectively-actuated links.

A further aspect of the present invention provides a retractable runningboard assembly for use with a vehicle having a passenger compartment anda door opening for permitting a person to enter and exit the passengercompartment. The retractable running board assembly includes an anchorconstructed and arranged to mount the running board assembly to thevehicle in an operative position beneath the door opening. Theretractable running board assembly also includes a elongated retractablerunning board having a non-circular cross-section perpendicular to alongitudinal direction thereof, and a running board moving assembly. Therunning board moving assembly includes at least one link connectedbetween the running board and the anchor and movably supporting therunning board. The link is constructed and arranged such that, when therunning board assembly is mounted to the vehicle in the operativeposition, actuation of the link moves the running board between (a) anextended position wherein the running board extends outwardly from thevehicle away from the door opening at an elevation lower than the dooropening and spaced above ground level for facilitating entry into thepassenger compartment via the door opening and (b) a retracted positionwherein the running board is retracted inwardly and raised upwardly fromthe extended position, the link enabling the running board to maintainessentially the same orientation during movement between the extendedand retracted positions. The running board moving assembly furtherincludes a selectively-operable driving mechanism operatively connectedto the link such that, when the running board assembly is mounted in theoperative position, selective operation of the driving mechanismactuates the link to move the running board between the retracted andextended positions.

This feature is considered advantageous in the context of using arunning board of non-circular cross-section, such as one with a flatstep surface or one with an ovular cross-section. With a board ofcircular cross-section, its orientation is not material, as it willprovide the same configuration for stepping thereupon irrespective ofits orientation. However, with a board of non-circular cross-section,maintaining its orientation the same between its extended and retractedpositions, and any other positions, is advantageous. Specifically, evenwhen the board is fully retracted, persons may still step on it and itis desirable to keep it properly oriented for this reason. Also, if theboard has multiple extended positions, it is desirable to maintain thesame orientations between positions.

A further aspect of the present invention provides a vehicle including apassenger compartment having a door opening for permitting a person toenter and exit the passenger compartment. The vehicle includes a panelhaving a first outer lateral surface. The vehicle also includes aretractable running board assembly mounted to the vehicle in anoperative position beneath the door opening. The retractable runningboard assembly includes a elongated retractable running boardselectively movable between an extended and a retracted position, and aselectively-operable driving mechanism operatively connected to therunning board to move the running board between the extended andretracted positions. The running board has a second outer lateralsurface positioned such that when the retractable running board is inthe retracted position, the first and second outer lateral surfaces forman essentially continuous surface at their intersection.

A further aspect of the present invention provides a retractable runningboard assembly for use with a vehicle having a passenger compartment anda door opening for permitting a person to enter and exit the passengercompartment. The assembly includes an anchor constructed and arranged tomount the running board assembly to the vehicle in an operative positionbeneath the door opening, an elongated retractable running board, and arunning board moving assembly. The running board moving assemblyincludes at least one selectively-actuated link connected between therunning board and the anchor and movably supporting the running board.The link is constructed and arranged such that, when the running boardassembly is mounted to the vehicle in the operative position, actuationof the link moves the running board between (a) a retracted position,(b) a primary extended position wherein the running board is moved atleast outwardly with respect to the vehicle from the retracted positionfor facilitating passenger entry into the passenger compartment via thedoor opening, and (c) a secondary extended position wherein the runningboard is moved upwardly from the primary extended position forfacilitating passenger access to a roof of the vehicle. Aselectively-operable driving mechanism is operatively connected to thelink such that, when the running board assembly is mounted in theoperative position, selective operation of the driving mechanismactuates the link to move running board between the retracted, primaryextended, and secondary extended positions.

Additional and/or alternative aspects, objects, features, and advantagesof the present invention will become apparent from the followingdescription, the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the present invention as well as otherobjects and further features thereof, reference is made to the followingdescription which is to be used in conjunction with the accompanyingdrawings, where:

FIG. 1 is a perspective view of a truck with a retractable running boardaccording to the present invention with the running board in an extendedposition;

FIG. 2 is a partial perspective view thereof with the running board inthe extended position;

FIG. 3 is a partial perspective view thereof with the running board in aretracted position;

FIG. 4 is a partial perspective view of an alternative embodiment of thepresent invention,

FIG. 5 is a partial perspective view of an additional alternativeembodiment of the present invention,

FIG. 6 is a front view of a further alternative embodiment of thepresent invention;

FIG. 7 is a front view of a further alternative embodiment of thepresent invention;

FIGS. 8A and 8B are partial perspective views of a further alternativeembodiment of the present invention;

FIG. 8C is a partial sectional view of the embodiment illustrated inFIGS. 8A and 8B, taken along the line 8C—8C in FIG. 8A.

FIGS. 9A and 9B are side views of planetary gear drives that may be usedin the present invention;

FIGS. 10 and 11 are perspective views of a further alternativeembodiment of the present invention;

FIGS. 12 and 13 are perspective views of a further alternativeembodiment of the present invention;

FIGS. 14-16 are perspective views of manual gearboxes according tofurther alternative embodiments of the present invention;

FIG. 17 is a partial perspective view of a manual gearbox according to afurther alternative embodiment of the present invention;

FIG. 18 is a perspective view of an alternative embodiment of aretractable running board with the running board in a retractedposition;

FIG. 19 is a perspective view of the retractable running board shown inFIG. 18 with the running board in a primary extended position;

FIG. 20 is a perspective view of the retractable running board shown inFIG. 18 with the running board in a secondary extended position;

FIG. 21 is a perspective view of the retractable running board shown inFIG. 18 with the running board in a retracted position;

FIG. 22 is a perspective view of the retractable running board shown inFIG. 18 with the running board in a primary extended position;

FIG. 23 is a schematic view of the retractable running board shown inFIG. 18 illustrating the relation between the retracted position, theprimary extended position, and the secondary extended position of therunning board; and

FIG. 24 is a front view of a latch and pawl system utilized for lockinga running board, such as the running board shown in FIG. 18, in anextended position, a primary extended position, and a secondary extendedposition.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

FIG. 1 illustrates a vehicle 10 that has a retractable running boardassembly 20 according to a preferred embodiment of the presentinvention. The retractable running board assembly 20 includes an anchor24 mounted to a frame (or body) 25 of the vehicle 10 in an operativeposition below a passenger compartment of the vehicle 10. The vehicle 10has a longitudinal direction that is defined by direction of movement ofthe vehicle 10. While the running board assembly 20 in this embodimentis disposed along the passenger side of the vehicle 10, the runningboard assembly 20 may alternatively be disposed along a variety of otherportions of the vehicle 10 such as the driver's side, the front, or theback. Further, the retractable running board assembly 20 according tothe present invention may also be utilized in other types of vehicles,such as construction equipment, sport utility vehicles, etc.

While the anchor 24 and the frame 25 are illustrated as distinctelements in this embodiment, the anchor may be an integral part of theframe/body without departing from the scope of the present invention.The term anchor is a structural term used herein to encompass anystructure mounting the assembly 20 to the vehicle 10.

FIG. 2 is an enlarged perspective view of the retractable running boardassembly 20. A longitudinally elongated retractable running board 26 isconnected to the anchor 24 via a running board moving assembly 27. Theboard 26 is preferably, but not necessarily, of a non-circularcross-section perpendicular to its longitudinal direction. Asillustrated, it is somewhat Z-shaped in cross-section. The running boardmoving assembly 27 includes a plurality of longitudinally spacedselectively-actuated links 28, 30, 32. In this embodiment, thelongitudinal direction of the running board 26 is generally parallel toa longitudinal direction of the vehicle 10. However, if the runningboard assembly 20 were disposed on the vehicle 10 in a position otherthan along the lateral sides, the running board 26 would not parallelthe longitudinal direction of the vehicle 10.

The running board moving assembly also includes a selectively-operabledriving mechanism that is operatively connected to each of the pluralityof selectively-actuated links 28, 30, 32 such that selective operationof the selectively-operable driving mechanism concertedly actuates eachof the selectively-actuated links 28, 30, 32 and moves the running board26 between an extended position (as shown in FIGS. 1 and 2) and aretracted position (as shown in FIG. 3). The driving mechanism may be ofany type, including a D.C. reversible electric motor, a fluid drivenmotor, or a manually operated input, such as a lever, a crank, a wheel,or a rotatable lug.

As best illustrated in FIG. 2, each of the links 28, 30, 32 comprises afour-bar mechanism. A first leg of the four-bar mechanism is defined bythe anchor 24. A second leg 36 connects to the first leg/anchor 24 forpivotal movement about a longitudinal axis 38 relative to the firstleg/anchor 24. The longitudinal axis 38 is generally parallel to thelongitudinal direction of the running board 26. A third leg 40 alsopivotally connects to the first leg/anchor 24. A fourth leg 42 pivotallyconnects to the second and third legs 36, 40 and is mounted to therunning board 26. The fourth leg 42 is preferably elongated so as toprovide structural support to the running board 26.

Actuation of the links 28, 30, 32 translationally moves the runningboard 26 along a generally arcuate or curved path that is generallyperpendicular to the longitudinal axis 38. Depending on the relativelengths of the legs 24, 36, 40, 42, the motion of the running board 26may also include a rotational component. In this embodiment, however,each four-bar mechanism comprises a parallelogram such that the path ofthe running board 26 has no rotational component and the running board26 is always generally level. The running board 26 therefore movesdownwardly and outwardly relative to the vehicle 10 and anchor 24 as itmoves from its retracted position to its extended position. When in theextended position, the running board 26 is preferably disposed (a) at aheight generally midway between ground level and a lower edge 43 a of anadjoining door opening 43 of the vehicle 10, and (b) at a lateralposition that is disposed at least partially outward from a side of thevehicle 10 in order to facilitate easy entrance into and exit from thevehicle 10. When the vehicle 10 is on level ground with the runningboard 26 in the extended position, the running board assembly 20 doesnot touch the ground.

While in this embodiment, the extended and retracted positions of therunning board 26 are both vertically and horizontally offset from eachother, the present invention should not be understood to be so limited.Rather, except where extension and retraction are expressly limited toincluding both horizontal and vertical components, the path of therunning board may comprise one or more of horizontal movement, verticalmovement, and rotational components.

The four-bar mechanisms used as the links 28, 30, 32 are designed suchthat a stepping platform 44 defined by a top surface of the runningboard 26 is generally level when the running board 26 is in the extendedposition. The links 28, 30, 32 are further preferably designed to holdthe running board 26 as close to the vehicle 10 as possible when therunning board 26 is in the retracted position.

The running board moving assembly 27 further includes a longitudinallyelongated torque transmitting member 50 that is mounted to each of thesecond legs 36 of the links 28, 30, 32 for common rotation with thesecond legs 36 about the longitudinal axis 38, which is preferablygenerally parallel to the longitudinal direction of the running board26. The torque transmitting member 50 may be rotationally coupled toeach of the second legs 36 using any of a variety of methods that wouldbe understood by one skilled in the art. For example, the torquetransmitting member 50 may have a square cross-section that fits intosquare holes in the second legs 36. Alternatively, a spline and keywaymay be used to rotationally couple the torque transmitting member 50 toeach of the second legs 36. The torque transmitting member 50 could alsobe welded to or formed integrally with the second legs 36.

The torque transmitting member 50 is operatively connected to the motor34 via a gear box 46. In this embodiment, the gearbox 46 operates as astep-down mechanism such that the torque transmitting member 50 rotatessubstantially slower than the motor 34. The gear box 46 preferablyincludes a worm gear operatively connected to the motor 34 and a wormwheel operatively connected to the torque transmitting member 50. Theworm gear and wheel serve dual functions by stepping down the speed ofthe motor 34 (and stepping up the torque) and locking the torquetransmitting member 50 and gear box 46 into fixed rotational positionswhen the motor 34 is not being operated. As one of ordinary skill in theart would readily appreciate, the meshing of the worm gear prevent andwheel prevent a rotational force acting upon the worm wheel fromrotating the worm gear (i.e., backdrive). Consequently, when the motor34 is not being operated, the torque transmitting member 50, links 28,30, 32, and running board 26 are locked into fixed positions, and hencethe worm wheel and worm gear may be considered a backdrive preventionmechanism. Because each of the links 28, 30, 32 individually locks inplace, the running board 26 is substantially immovable relative to theanchor 24 even when the weight of a passenger is exerted on alongitudinal end of the running board 26.

The selectively-operable motor 34 is an electric motor that is operatedwith a conventional electrical control circuit. If the control circuitis automatically controlled, the circuit could selectively operate themotor 34 to extend the running board into its extended position when thevehicle 10 is placed in park, when the doors are opened, when theignition is turned off, etc. Alternatively, if the control circuit ismanually controlled, an operation switch could be placed within the cabof the truck to allow an operator to selectively control the extensionposition of the running board 26.

While the illustrated motor 34 is an electric rotational motor, a motoraccording to the present invention could comprise a variety of othertypes of motors. For example, the motor 34 could be a linear motor, ahydraulic motor, a hydraulic cylinder, a linear actuator, etc.

FIG. 4 illustrates an alternative embodiment of a retractable runningboard assembly 58 of the present invention, which is generally similarto the previous embodiment. Where identical elements are utilized,identical reference numbers are used. In this embodiment, only twoselectively-actuated links 28, 32 are used. Further, instead of using asingle torque transmitting member as in the previous embodiment, twoshort torque transmitting members 60, 62 are rotationally coupled to thesecond legs 36 of the links 28, 32, respectively. Worm wheels 66 arerotationally coupled to each of the torque transmitting members 60, 62.Worm gears 68 mesh with each of the worm wheels 66. Each of the wormgears 68 is operatively connected to a motor 70 via a flexible torquetransmitting cable 72 and a gear box 74. The flexible torquetransmitting cable 72 preferably comprises a rotating inner cablemounted within an outer sheath. Each inner cable is operativelyconnected to a worm gear 68 and the gear box 74 in a conventionalmanner. As in the previous embodiment, the worm gears 68 and wheels 66prevent the links 28, 32 from moving when the motor 70 is not beingoperated. When the motor 70 is operated, the links are concertedlyactuated to extend and retract the running board 26. Because flexibletorque transmitting cables 70 connect the motor 70 to the links 28, 32(as opposed to the rigid connection of the previous embodiment), themotor 70 may be mounted in any convenient position on the vehicle 10.

FIG. 5 is a perspective view of an additional alternative embodiment ofthe present invention, which is generally similar to the embodimentillustrated in FIGS. 1-3. Two retractable running board assemblies 80,82, which are generally similar to the running board assembly 20illustrated in FIGS. 1-3, are provided. The running board assembly 80 ispreferably mounted to a vehicle below passenger doors on one lateralside of the vehicle while the running board assembly 82 is preferablymounted below passenger doors on an opposite lateral side of thevehicle. Consequently, retractable running boards 124, 126 are providedat the passenger compartment openings on both lateral sides of thevehicle.

The anchor 84 of the running board assemblies 80, 82 is preferablymounted to the left and right sides of a vehicle such as the vehicle 10below the passenger doors located on either lateral side of the vehicle10. As in the previous embodiments, the anchor 84 may comprise aplurality of independent portions or a single integral piece. In thisembodiment, the anchor 84 comprises a plurality of independent piecesthat are each constructed and arranged to be mounted to a vehicle suchas the vehicle 10 illustrated in FIG. 1.

Unlike the embodiment illustrated in FIGS. 1-3, however, the motor 100is not directly geared to the longitudinally elongated torquetransmitting members 102, 104. Instead, the motor 100 is operativelyconnected to a gearbox 106, which, in turn, is operatively connected toflexible torque transmitting cables 108, 110. The flexible torquetransmitting cables 108, 110 are operatively connected to the torquetubes 102, 104, respectively (preferably via worm gears and wheels as inthe previous embodiments). The torque transmitting members 102, 104, areeach connected to a plurality of selectively-actuated links 112, 114,116 and 118, 120, 122, respectively, which are generally identical tothe links 28, 30, 32 of the embodiment illustrated in FIGS. 1-3. Runningboards 124, 126 are operatively connected to the links 112, 114, 116 and118, 120, 122, respectively. Like the motor 70 of the previousembodiment, the motor 100 of the present embodiment may be disposed atany convenient position on a vehicle.

This embodiment may also include just one running board assembly 102without departing from the scope of the present invention.

FIG. 6 illustrates an additional alternative embodiment of a retractablerunning board assembly 200 according to the present invention. Therunning board assembly 200 is generally similar to the running boardassembly 20 except that the selectively-actuated links 202, 204, 206comprise cam slides and linear actuators instead of four-bar mechanisms.

Each of the links 202, 204, 206 comprises a cam track 210 rigidlymounted to an anchor 212, which is, in turn, rigidly mounted to a frame213 of a vehicle. A plurality of cam sliders 214 are mounted to alongitudinally elongated running board 216, which also has anon-circular cross-section, and are supported by the cam track 210 so asto allow the cam sliders 214 to move freely along the track 210 betweenan extended position (as shown in FIG. 6) and a retracted position(position in which cam sliders 214 are shown in phantom in FIG. 6). Ateach link 202, 204, 206, a conventional lead-screw linear actuator 218connects the anchor 212 to the running board 216. The linear actuator218 preferably includes a threaded nut 220 pivotally mounted to therunning board 216. A lead screw 222 is threaded into the nut 220. A base224 of the linear actuator 218 is pivotally connected to the anchor 212for relative rotation therebetween about a longitudinal axis 225. Thebase 224 supports the lead screw 222 so as to prevent relative movement(e.g., backdrive) between the lead screw 222 and the base 224 along alead screw axis 226 while allowing relative rotation between the leadscrew 222 and the base 224 about the lead screw axis 226. A worm wheel230 is mounted to the lead screw 222 for common rotation about the leadscrew axis 226.

A longitudinally elongated torque transmitting member 232, which isgenerally identical to the torque transmitting member 50 of the runningboard assembly 20, is mounted for rotation relative to the anchor 212about the longitudinal axis 225. A motor like the motor is operativelyconnected to the torque transmitting member 225 in the same fashion asthe motor 34 is connected to the torque transmitting member 50 in therunning board assembly 20 illustrated in FIGS. 1-3. At each link 202,204, 206, a worm gear 234 is mounted onto the torque transmitting member232 for common rotation therewith about the longitudinal axis 225. Theworm gear 234 meshes with the worm wheel 230 such that rotation of thetorque transmitting member 232 actuates the lead screw actuator 218 toextend or retract the running board 216 along the cam slide 210 with therunning board 216 maintaining essentially the same orientation betweenits extended and retracted positions.

The torque transmitting member 232 may have a rotational displacementthat is greater than or less than 360 degrees. The term, rotation, istherefore intended to encompass angular displacements greater than orless than 360 degrees. In this embodiment, the rotational displacementof the torque transmitting member is preferably greater than 360degrees. However, in the previous embodiments that include four-barmechanisms, the rotational displacements of the torque transmittingmembers 50, 60, 62, 102, 104 are preferably less than 360 degrees.

As would be appreciated by one skilled in the art, instead of mountingthe cam track 210 to the anchor and the cam sliders 214 to the runningboard 216, the cam track 210 could be conversely rigidly mounted to therunning board 216 and the cam sliders 214 could be mounted to theanchor.

While in the embodiment illustrated in FIG. 6, the cam track 210 forms aslight “S” shape, the cam track 210 could also be shaped in a variety ofother ways. For example, FIG. 7 illustrates an additional alternativeembodiment, which is generally similar to the previous embodiment,except that the cam track 310 is linear.

FIGS. 8A-8C illustrate an additional embodiment of a retractable runningboard assembly 500 of the present invention, which is generallyidentical to the retractable running board assembly 58 illustrated inFIG. 4 and discussed above. Accordingly, a redundant description of themechanical principles is not provided. However, the retractable runningboard assembly 500 differs from the retractable running board assembly58 in the following respects.

As illustrated in FIGS. 8A and 8C, the retractable running boardassembly 500 includes a running board 510 that replaces/defines the sillof the vehicle 520. When the retractable running board assembly 500 isin the retracted position (as illustrated in FIGS. 8A and 8C), an upperedge 525 of an outer lateral surface 530 of the running board 510 abutsa lower edge 560 of an outer lateral surface 540 of a side panel 544 ofthe vehicle 520. When the retractable running board 500 is in theretracted position, the surfaces 530, 540 preferably generally form anaesthetically-appealing, smooth, essentially continuous surface at theirintersection. The surfaces 530, 540 still form an essentially continuoussurface even if small gaps and/or minor imperfections exist between thesurfaces 530, 540. Alternatively, the surfaces 530, 540 may havedifferent angles such that a vertex is formed at the intersectionbetween the surfaces 530, 540.

As illustrated in FIG. 8C, when the retractable running board 510 is inthe retracted position, an upper surface 550 of the retractable runningboard 510 abuts a lower surface 565 of the side panel 544. Asillustrated in FIG. 8B, when the retractable running board assembly 500is extended, the retractable running board assembly 500 functions in thesame manner and is positioned in the same general location as theretractable running board assembly 58. The other illustrated retractablerunning board assemblies may also be modified in a similar manner toreplace the sill of the vehicle.

FIG. 9A illustrates a planetary gear drive 600, which may be used inplace of the worm gear and wheel or the linear actuator as abackdrive-prevention mechanism in any of the embodiments of the presentinvention. For illustrative purposes, the planetary gear drive 600 isdescribed as being incorporated into the gearbox 46 of the embodimentillustrated in FIG. 2 and described above. Like the worm gear that ispreferably included in the gearbox 46 in FIG. 2, the planetary geardrive 600 serves the dual functions of stepping down the speed of themotor 34 (and stepping up the torque) and locking theselectively-actuated links 28, 30, 32 in place. As would be appreciatedby one of ordinary skill in the art, the backdrive-preventing feature ofthe planetary gear drive 600 ensures that the motor 34 can drive thelinks 28, 30, 32 but that the links 28, 30, 32 cannot drive the motor34.

As illustrated in FIG. 9A, the planetary gear drive 600 includes aninput shaft 610 that is operatively connected to the motor 34 (not shownin FIG. 9A). An eccentric 620 is rigidly fixed to the input shaft 610and rotates with the input shaft 610. A planetary gear 630 is mountedonto the eccentric 620 to allow the planetary gear 630 to rotaterelative to the eccentric 620. A pin 640 is mounted to the planetarygear 630 and fits into a track formed on a base 650. The base 650includes cam surfaces that abut the eccentric 620 to keep the base 650laterally aligned (left/right as illustrated in FIG. 9A) with theplanetary gear 630. The base 650 is mounted to a portion 670 of thegearbox 46 via two intermediate pivot bars 660 that permit the base 650to move laterally to some extent as the base 650 follows thetranslational motion of the planetary gear 630. The planetary gear 630meshes with a ring gear 680 that is operatively, rotationally connectedto the torque transmitting member 50 (not shown in FIG. 9A).

During operation of the planetary gear drive 600, the motor 34 drivesthe input shaft 610 and eccentric 620, which causes the planetary gear630 to translate in a circular path defined by the eccentricity of theeccentric 620. However, the pin 640, base 650, and pivot bars 660prevent the planetary gear 630 from rotating. The circular translationalmovement of the planetary gear 630 is converted into rotation of thering gear 680. The ring gear 680 rotationally drives the torquetransmitting member 50. As would be appreciated by one of ordinary skillin the art, the planetary gear drive 600 thereby provides significantgear reduction while preventing backdrive.

FIG. 9B illustrates an additional planetary gear drive 690 that may beused instead of the above-described worm gear or planetary gear drive600. The planetary gear drive 690 is simpler than the planetary geardrive 600, but produces slight output pulsations. As would also be aappreciated by one of ordinary skill in the art, a variety of otherknown backdrive-prevention mechanisms may alternatively be used withoutdeparting from the scope of the present invention. For example, a pawland ratchet or a spring clutch could be used.

FIGS. 10 and 11 illustrate an additional alternative embodiment of aretractable running board assembly 700 according to the presentinvention. As in the previous embodiments, a longitudinally elongatedretractable running board 702 is connected to an anchor 704 via aplurality of longitudinally spaced, selectively-actuated links 710, 720.A selectively-operable motor 730 is operatively connected to each of thelinks 710, 720 such that selective operation of the motor 730concertedly actuates each of the links 710, 720 and moves the runningboard 702 between an extended position (as shown in FIG. 11) and aretracted position (as shown in FIG. 10).

As illustrated in FIG. 10, each of the links 710, 720 comprises afour-bar mechanism. A first leg of the four-bar mechanism is defined bythe anchor 704. A second leg 740 connects to the first leg/anchor 704for pivotal movement about a generally vertical axis 742. A third leg750 also pivotally connects to the first leg/anchor 704. A fourth leg760 pivotally connects to the second and third legs 740, 750 and ismounted to the running board 702. In this embodiment, the running board702 and fourth legs 760 are integrally formed. However, the runningboard 702 and fourth legs 760 may also be separately formed.

The four-bar mechanisms defined by the links 710, 720 are preferablyparallelograms. Consequently, during the extension and retraction of therunning board assembly 700, the fourth legs 760 remain parallel to theanchor 704.

The lengths of each of the legs 704, 740, 750, 760 of the link 710 arepreferably equal to the lengths of the corresponding legs 704, 740, 750,760 of the link 720. Consequently, during concerted actuation of thelinks 710, 720, the resulting movement of the fourth legs 760 issynchronous and prevents the running board 702 from rotating relative tothe anchor 704.

Because the pivotal axes of the links 710, 720 are generally verticallyoriented (+/− several degrees and preferably within two degrees ofvertical), the movement of the running board 702 relative to the anchor704 is substantially limited to a horizontal path (+/− several verticalinches and preferably +/−3 vertical inches). During extension andretraction of the running board assembly 700, the running boardtranslationally follows a curved path defined by the links 710, 720, butdoes not rotate. Consequently, the running board 702 is disposed at asubstantially constant height regardless of its extension position. Asillustrated in FIGS. 10 and 11, the running board 702 moveslaterally-outwardly relative to the anchor 704 as it extends from itsretracted position to its extended position.

The motor 730 is operatively connected to the links 710, 720 via alongitudinally elongated torque transmitting member 770. The torquetransmitting member 770 may be directly rotationally mounted to themotor 730 or may be operatively connected to the motor 730 via a geardrive system that either steps up or steps down the speed of the torquetransmitting member 770 relative to the motor 730.

In the illustrated embodiment, the torque transmitting member 770 isoperatively connected to the second legs 740 of the links 710, 720 viaworm gear drives that are provided at each connection between the torquetransmitting member 770 and a link 710, 720. Each worm gear driveincludes a worm gear 780 mounted onto the torque transmitting member770. While separate worm gears 780 are illustrated, the separate wormgears 780 may alternatively each comprise a part of a single extendedworm gear without departing from the scope of the present invention. Theworm gear drive also includes a worm wheel 790 that meshes with the wormgear 780 and is mounted to the second leg 740 for common rotationalmovement relative to the anchor 704 about the axis 742. During extensionor retraction of the running board assembly 700, the motor 730 rotatesthe torque transmitting member 770, which, in turn, concertedly actuatesthe second legs 740 of the links 710, 720. Actuation of the second legs740 actuates the links 710, 720 and extends or retracts the runningboard 702.

As in the previous embodiments, because the worm gear drives preventbackdrive of the links 710, 720, the running board assembly 700 remainsin an essentially locked position unless actuated by the motor 730. Aswould be appreciated by one of ordinary skill in the art, a variety ofother backdrive-prevention mechanisms may also be used (for example,either of the planetary gear drives 600 or 690) without departing fromthe scope of the present invention.

Furthermore, a backdrive-prevention mechanism may alternatively beomitted altogether. Because the running board assembly 700 is limited togenerally horizontal movement, the vertical weight that is applied tothe running board 702 when a person steps onto the running board 702will not tend to extend or contract the running board assembly 700.Accordingly, unlike in the previous embodiments where the weight of apassenger on a running board creates a force that tends to actuate theretractable running board assembly and backdrive the driving mechanism,backdrive is not as significant a problem where the path of the runningboard 702 is generally horizontal. A backdrive-prevention mechanism isnonetheless preferably included in the retractable running boardassembly 700 because some backdrive-causing lateral loads could beexerted on the running board 702 during normal use.

As in the previous embodiments, the anchor 704 may form or be attachedto any desired part on a vehicle.

While the above-described embodiments include either two or threepowered links attaching each running board to each anchor, except whereotherwise expressly stated, a running board assembly according to thepresent invention may have more or less powered links. Further,additional freely moving links may also be provided, as is known in theart. For example, FIGS. 12 and 13 illustrate an additional embodiment ofa retractable running board assembly 800 according to the presentinvention. This running board assembly 800 is generally identical to therunning board assembly 700 illustrated in FIGS. 10 and 11 except thatonly one of the two links 810, 820 is powered (driven). A second leg 840of the selectively-actuated link 820 is operatively connected to a motor850, preferably via a worm gear drive and/or other gear reductionmechanisms. Consequently, the link 820 is selectively actuated by themotor 850. Conversely, the free link 810 is not directly operativelyconnected to the motor 850 and simply follows the movement of the link820 as forces are transferred from the link 820, through the runningboard 860, to the link 810.

The running board assembly 800 can use just a single powered link 820because, as is analogously discussed above with respect to theretractable running board assembly 700, the limited horizontal path ofthe running board 860 ensures that significant backdrive creating forcesare not applied to the links 810, 820 and motor 850. One powered link820 is therefore sufficient to hold the running board 860 stationary.

While the selectively-operable driving mechanism in the previousembodiments comprises an electric motor such as the motor 34 illustratedin FIG. 2, the selectively operable driving mechanism according to thepresent invention encompasses a variety of other actuators, bothautomatic and manual, as well. Such selectively-operable drivingmechanisms include hydraulic or air motors, linear actuators, hydrauliccylinders, etc. For example, FIG. 14 illustrates a manualselectively-operable driving mechanism, which is similar to thepreviously described embodiments except that a manually-rotatable headreplaces the electric motors in the previous embodiments. A gearbox 900comprises a housing 910, a worm wheel 920 pivotally connected to thehousing 910 for rotation about a worm wheel axis 930, a worm gear 940pivotally connected to the housing 910 and meshing with the worm wheel920, and a manually-rotatable head in the form of a hand-operatedcontrol wheel 950 operatively connected to the worm gear 940.

The worm wheel 920 may be operatively, rotationally, coupled to any ofthe previously described running board assemblies. For example, thegearbox 900 may replace the gearbox 46 of the retractable running boardassembly 20 illustrated in FIG. 2, in which case the worm wheel 920would be operatively connected to the torque member 50. To use themanually operated gearbox 900, an operator may use his/her hands torotate the control wheel 950, which rotates the worm gear 940. Rotationof the worm gear 940 rotates the worm wheel 920, which rotates thetorque member 50 and actuates the retractable running board assembly 20.As described above, the worm wheel 920 and gear 940 prevent backdrive ofthe gearbox 900 and attached torque member 50 and running board assembly20.

FIG. 15 illustrates a possible modification to the gearbox 900illustrated in FIG. 14. This remotely, manually-operated gearbox 1000 isvery similar to the gearbox 900, except that a control wheel 1010 of thegearbox 1000 is remotely located. Accordingly, the control wheel 1010 isoperatively connected to a worm gear 1020 via a flexible torque cable1030 that is similar to the cables described above with respect toprevious embodiments. The flexible torque cable allows the control wheel1010 to be mounted in any convenient position in a vehicle. For example,the control wheel may be mounted within the cab of a truck so that anoperator can manually operate the retractable running board assemblywithout having to first exit the vehicle to gain access to the controlwheel.

FIG. 16 illustrates a further possible modification to the gearbox 900.A the gearbox 1100 is similar to the gearbox 900 except that themanually-rotatable head comprises a hex head 1110 instead of a controlwheel 950 as is utilized by the gearbox 900. The hex head 1110 ispreferably sized to match a jack tool, lug wrench, or other tool that istypically kept in the associated vehicle. To operate the gearbox 1100,an operator connects the tool to the hex head 1110 and rotates the toolto rotate the hex head 1110 and actuate the associated retractablerunning board assembly.

FIG. 17 illustrates a further manually-rotatable head in the form of ahollow receiver 1200 that may replace the hex head 1110 in the gearbox1100. The hollow receiver 1200 may be rotated using a drive blade thatsuch as a large flat-head screwdriver or the prying end of a jack tool.As would be appreciated by one of ordinary skill in the art, a varietyof alternatively shaped pieces may replace the above-described controlwheel 950, hex head 1110, or hollow receiver 1200.

The manual driving mechanisms shown in FIGS. 14-17 for manually drivingthe torque transmitting member may be provided in addition to or in lieuof an electric motor. Specifically, if the vehicle loses power, theoperator can bypass the motor and manually drive the torque transmittingvia the manual driving mechanism to manually actuate the running board.

FIGS. 18-22 illustrate an additional alternative embodiment of aretractable running board assembly 1300. As in the previous embodiments,a longitudinally elongated retractable running board 1302 (which has anon-circular cross-section, and in this case ovular) is connected to ananchor 1304 via a running board moving assembly 1306. The running boardmoving assembly 1306 includes first and second selectively actuatedlinks 1308, 1310 that movably support the running board 1302 atlongitudinally spaced apart positions. The links 1308, 1310 areconstructed and arranged such that, when the running board assembly 1300is mounted to the vehicle in the operative position, actuation of thelinks 1308, 1310 moves the running board 1302 between a retractedposition (as shown in FIGS. 18 and 21), a primary extended position (asshown in FIGS. 19 and 22) (also referred to as the step position),wherein the running board 1302 is moved at least outwardly with respectto the vehicle from the retracted position for facilitating passengerentry into the passenger compartment via the door opening, and asecondary extended position (as shown in FIG. 20) (also referred to asthe roof position), wherein the running board 1302 is moved upwardlyfrom the primary extended position for facilitating passenger access toa roof of the vehicle for loading articles onto the roof or washing theroof, for example.

As shown in FIGS. 18-20, a selectively-operable driving mechanism 1312is operatively connected to the links 1308, 1310 such that, when therunning board assembly 1300 is mounted in the operative position,selective operation of the driving mechanism 1312 actuates the links1308, 1310 to move the running board 1302 between the retracted, theprimary extended, and the secondary extended positions. In theillustrated embodiment, the driving mechanism 1312 includes a biasingstructure 1314 that is operatively connected to the links 1308, 1310 tobias the running board 1302 away from the retracted position towards theprimary extended and secondary extended positions, as will be furtherdiscussed.

As best shown in FIGS. 18-20, each of the links 1308, 1310 comprises afour bar mechanism. A first leg of the four bar mechanism is defined bythe anchor 1304. A second leg 1316 connects to the first leg/anchor 1304for pivotal movement about a generally horizontal axis 1318 (see FIGS.21-22). A third leg 1320 also pivotally connects an extension 1322provided on the first leg/anchor 1304. A fourth leg 1324 pivotallyconnects to the second and third legs 1316, 1320, and is mounted to therunning board 1302. The running board 1302 and fourth legs 1324 may beformed as a single structure or may be separately formed and rigidlyconnected to one another.

During movement of the running board 1302 between the retracted, primaryextended, and secondary extended positions, the running board 1302 movesin an arcuate path, but does not rotate, and thus maintains essentiallythe same orientation throughout its range of movement. As a result, therunning board 1302 is disposed at different vertical heights dependingon whether it is in the retracted, primary extended, or secondaryextended position.

In the embodiment, the four bar mechanism comprises a parallelogram suchthat the path of the running board 1302 has essentially no rotationalcomponent. Thus, the running board 1302 moves downwardly and outwardlyrelative to the vehicle and anchor 1304 as it moves from its retractedposition to the primary extended position. The running board 1302 movesupwardly and outwardly as it moves from the primary extended position tothe secondary extended position. FIG. 23 illustrates the relationbetween the retracted position, the primary extended position, and thesecondary extended position of the running board 1302 with respect to aside wall 1326 of a vehicle. Specifically, the running board 1302A is inthe retracted position, the running board 1302B is in the primaryextended position, and the running board 1302C is in the secondaryextended position.

While in this embodiment the retracted, primary extended, and secondaryextended positions of the running board 1302 are both vertically andhorizontally offset with respect to one another, the present inventionshould not be understood to be so limited. Rather, except whereextension and retraction are expressly limited to include bothhorizontal and vertical components, the path of the running board 1302may comprise one or more of horizontal movement, vertical movement, androtational components.

The running board moving assembly 1306 further includes a longitudinallyelongated torque transmitting member 1328 that is mounted to each of thesecond legs 1316 of the links 1308, 1310 for a common rotation with thesecond legs 1316 about the axis 1318 which is generally parallel to thelongitudinal direction of the running board 1302. The torquetransmitting member 1328 may be rotationally coupled to each of thesecond legs 1316 using any of a variety of methods that would beunderstood by one skilled in the art.

One end of the torque transmitting member 1328 is operatively connectedto the biasing structure 1314. The biasing structure 1314 includes atorsion spring 1315 that is mounted between the anchor 1304 and thetorque transmitting member 1328. The torsion spring 1315 is structuredto bias the torque transmitting member 1328 in a clockwise direction (asviewed in FIGS. 18-20), which in turn concertedly actuates the secondlegs 1316 of the links 1308, 1310 to bias the running board 1302 awayfrom the retracted position towards the secondary extended position. Therunning board 1302 must be manually moved in its retracting direction,against biasing from the torsion spring 1315, from the secondaryextended position towards the primary extended and retracted positions.

The biasing structure 1314 also includes an over-center spring 1317 thatis mounted between the anchor 1304 and the second leg 1316. Theover-center spring 1317 provides a biasing force that facilitatesmovement of the running board 1302 from the primary extended position tothe secondary extended position. The over-center spring 1317 alsoprovides a biasing force that facilitates movement of the running board1302 from the primary extended position to the retracted position.

That is, the torsion spring 1315 provides the majority of the biasingforce to rotate the running board 1302 from the retracted positiontowards the secondary extended position. The over-center spring 1317provides an additional biasing force to facilitate movement of therunning board 1302 from the primary extended position to the secondaryextended position. Further, the over-center spring 1317 is structured toprovide a biasing force to assist rotation of the running board 1302from the primary extended position to the retracted position.Specifically, the over-center spring 1317 is structured to provide abiasing force that is opposite in direction to the biasing force of thetorsion spring 1315 when the running board 1302 is moved from theprimary extended position to the retracted position so as to offset thebiasing force of the torsion spring and hence facilitate movement of therunning board 1302 from the primary extended position to the retractedposition.

As shown in FIGS. 21, 22, and 24, a locking mechanism 1330 isoperatively connected to the opposite end of the torque transmittingmember 1328 to lock the running board 1302 in the retracted, primaryextended, and secondary extended positions.

Specifically, the torque transmitting member 1328 is rigidly attached toa leg 1332 having an outwardly extending pin 1334, also referred to as astriker. The leg 1334 rotates about the axis 1318 of the torquetransmitting member 1328 as the running board 1302 is moved between theretracted, primary extended, and secondary extended positions. Thestriker 1334 of the leg 1332 is locked in position by the lockingmechanism 1330 to lock the torque transmitting member 1328 and hence therunning board 1302 in the retracted, primary extended, and secondaryextended positions. For example, FIG. 21 shows the striker 1334 lockedin position by the locking mechanism 1330 to lock the running board 1302in the retracted position. FIG. 22 shows the striker 1334 locked inposition by the locking mechanism 1330 to lock the running board 1302 inthe primary extended position.

As shown in FIG. 24, the locking mechanism 1330 is in the form of alatch and pawl system that includes first and second pawls 1336, 1338and first, second and third latches 1340, 1342, 1344. In the illustratedembodiment, the first latch 1340 engages the striker 1334 to lock therunning board 1302 in the retracted position (see FIG. 21), the secondlatch 1342 engages the striker 1334 to lock the running board 1302 inthe primary extended position (see FIG. 22), and the third latch 1344engages the striker 1334 to lock the running board 1302 in the secondaryextended position. The pawls 1336, 1338 are movable by the user betweenan open position (shown in a dashed line) and a closed position (shownin a solid line) to unlock and lock the latches 1340, 1342, 1344,thereby controlling movement of the running board 1302 between theretracted, primary extended, and secondary extended positions.

Specifically, the pawls 1336, 1338 are normally biased by a spring 1346into the closed position. The pawls 1336, 1338 can be moved into theopen position, against biasing from the spring 1346, by a cablemechanism 1348 that is operatively connected to the pawls 1336, 1338.The cable mechanism 1348 can be pulled to move the pawls 1336, 1338 tothe open position. The cable mechanism 1348 is simply released to allowthe pawls 1336, 1338 to return to the closed position under biasing fromthe spring 1346. The cable mechanism 1348 may include a handle, locatedon the interior or exterior of the vehicle, to facilitate movement ofthe cable mechanism 1348 from the closed position to open position bythe user.

The first, second and third latches 1340, 1342, 1344 are rotatablymounted for rotation between open and closed positions. In the openposition, the latches 1340, 1342, 1344 are positioned to receive thestriker 1334. In the closed position, the latches 1340, 1342, 1344 arepositioned to prevent movement of the striker 1334.

As shown in FIG. 24, the first latch 1340 is rotatably mounted forrotation between an open position (shown in a dashed line) and a closedposition (shown in a solid line). The first latch 1340 is biased to theopen position by a spring 1350. The first latch 1340 includes legs 1352,1354 that define a recess 1356 therebetween for receiving the striker1334. Stop structures 1358 are provided to define a range of rotation ofthe first latch 1340, and hence define the open and closed positions ofthe first latch 1340.

The second latch 1342 is rotatably mounted for rotation between a firstopen position O1 (shown in a dashed line), a closed position (shown in asolid line), and a second open position O2 (shown in a dashed line). Thesecond latch 1342 is biased to either the first open position O1 or thesecond open position O2 by a spring 1360. The second latch 1342 includeslegs 1362, 1364 that define a recess 1366 therebetween for receiving thestriker 1334. Stop structures 1368 are provided to define a range ofrotation of the second latch 1342, and hence define the first open andsecond open positions of the second latch 1342.

The third latch 1346 is rotatably mounted for rotation between an openposition (shown in a dashed line) and a closed position (shown in asolid line). The third latch 1346 is biased to the open position by aspring 1370. The third latch 1346 includes legs 1372, 1374 that define arecess 1376 therebetween for receiving the striker 1334. Stop structures1378 are provided to define a range of rotation of the third latch 1346,and hence define the open and closed positions of the third latch 1346.

In the illustrated embodiment, the springs 1350, 1360, and 1370 areover-center springs structured to leave the respective latch in aposition in which the recess of the respective ratchet faces thedirection of movement of the striker 1334. Thus, the latch is positionedto receive the striker 1334 within the recess thereof.

Operation of the locking mechanism 1330 will now be described in greaterdetail. When the pawls 1336, 1338 are in the open position, the pawls1336, 1338 are structured to allow the latches 1340, 1342, 1346 torotate to the open positions. When the pawls 1336, 1338 are in theclosed position, the pawls 1336, 1338 are structured to be engagablewith at least one of the legs of the latches 1340, 1342, 1346 to blockand prevent rotation of the latches 1340, 1342, 1346.

Specifically, when the running board 1302 is in the retracted position,the striker 1334 is positioned within the recess 1356 of the first latch1340 with the first latch 1340 locked in the closed position by theclosed pawl 1336. That is, pawl 1336 engages the leg 1352 to preventrotation of the first latch 1340. As a result, the striker 1334 islocked by the first latch 1340 which locks the torque transmittingmember 1328 and hence the running board 1302 in the retracted position.Movement of the pawls 1336, 1338 to the open position by the cablemechanism 1348 allows the first latch 1340 to rotate towards the openposition, which allows the torque transmitting member 1328 to rotate,which in turn allows the running board 1302 to move from retractedposition towards the primary extended position.

As the running board 1302 moves from retracted position towards theprimary extended position, the striker 1334 disengages from the firstlatch 1340 and moves towards the second latch 1342, which is in thefirst open position O1. The cable mechanism 1348 can be released toallow the pawls 1336, 1338 to return to the closed position. The striker1334 engages the second latch 1342 and moves the second latch 1342towards the closed position. When the second latch 1342 reaches theclosed position, the striker 1334 is positioned within the recess 1366of the second latch 1342 with the second latch 1342 locked in the closedposition by the closed pawls 1336, 1338. That is, the pawls 1336, 1338engage respective leg 1362, 1364 to prevent rotation of the second latch1342. As a result, the striker 1334 is locked by the second latch 1342which locks the torque transmitting member 1328 and hence the runningboard 1302 in the primary extended position. Movement of the pawls 1336,1338 to the open position by the cable mechanism 1348 allows the secondlatch 1342 to rotate towards the second open position O2, which allowsthe torque transmitting member 1328 to rotate, which in turn allows therunning board 1302 to move from primary extended position towards thesecondary extended position. Movement of the pawls 1336, 1338 to theopen position also allows the second latch 1342 to rotate towards thefirst open position O1 which allows the torque transmitting member 1328to rotate, which in turn allows the running board 1302 to move fromprimary extended position back into the retracted position.

As the running board 1302 moves from primary extended position towardsthe secondary extended position, the striker 1334 disengages from thesecond latch 1342 and moves towards the third latch 1344, which is inthe open position. The cable mechanism 1348 can be released to allow thepawls 1336, 1338 to return to the closed position. The striker 1334engages the third latch 1344 and moves the third latch 1344 towards theclosed position. When the third latch 1344 reaches the closed position,the striker 1334 is positioned within the recess 1376 of the third latch1344 with the third latch 1344 locked in the closed position by theclosed pawl 1338. That is, the pawl 1338 engages the leg 1374 to preventrotation of the third latch 1344. As a result, the striker 1334 islocked by the third latch 1344 which locks the torque transmittingmember 1328 and hence the running board 1302 in the secondary extendedposition. Movement of the pawls 1336, 1338 to the open position by thecable mechanism 1348 allows the third latch 1344 to rotate towards theopen position, which allows the torque transmitting member 1328 torotate, which in turn allows the running board 1302 to move fromsecondary extended position back towards the primary extended position.

If the pawls 1336, 1338 are held in the open position by the cablemechanism 1348, the running board 1302 can move from the retractedposition, through the primary extended position and into the secondaryextended position under biasing from the biasing structure 1314. To movethe running board 1302 from the secondary extended position to theprimary extended position or from the primary extended position to theretracted position, the user must move the pawls 1336, 1338 to the openposition by the cable mechanism 1348 and manually push the running board1302 against biasing of the biasing structure 1314.

That is, holding the pawls 1336, 1338 in the open position by the cablemechanism 1348 allows the latches 1340, 1342, 1344 to move to the openpositions, which in turn allows the torque transmitting member 1328 torotate without the striker 1334 locking up in any of the retracted,primary extended, and secondary extended positions.

It is contemplated in this illustrated embodiment that the running board1302 will be extended to is primary extended and secondary extendedpositions as follows. The user activates a handle or other structure topull cable 1348 and move pawls 1336, 1338 to their open positions andfrees the latches 1340, 1342, 1344. This allows torsion spring 1315 toautomatically move the board 1302 in the extending direction withstriker 1334 disengaging from latch 1340. A short pull of the cable 1340will cause the board 1302 to go to the primary extended position withthe striker 1334 engaging with striker 1340, and the pawls 1336, 1338returning to their close position to prevent further travel. A longerpull will allow the striker 1334 to pass through latch 1342 and engagewith latch 1344, whereat the board 1302 will be in its secondaryextended position. To move the board 1302 back to its retractedposition, the user actuates the handle or other structure again to movepawls 1336, 1338 to their open positions and pushes the board back inthe retracting direction. Preferably, the handle is mounted on theapparatus itself, or on the vehicle near the apparatus, so the handlecan be actuated with one hand and the board can be pushed in with theother.

In another embodiment, an automatic system may be provided to lock therunning board in the retracted, primary extended, and secondary extendedpositions. The automatic system may include a worm gear mounted on thetorque transmitting member, a motor assembly associated with the wormgear and having three limit switches, and an electronic control unit.The control unit receives signals for the desired running board positionand then sends outputs to the motor assembly to rotate the torquetransmitting member via the worm gear to the appropriate position. Theappropriate position is determined by the three limit switches thatcorrespond to retracted, primary extended, and secondary extendedpositions.

While the running board assembly 1300 of the illustrated embodimentincludes two links 1308, 1310 that connect the anchor 1304 with therunning board 1302, the running board assembly 1300 may include morethan two links to connect the anchor 1304 with the running board 1302.Further, retractable board assemblies 1300 may be provided at passengercompartment openings on one or both lateral sides of the vehicle. Also,it should be understood that the torque transmitting member 1328 may beoperatively connected to a motor to move the running board 1302 betweenthe retracted, primary extended, and secondary extended positions.Moreover, a manual driving mechanism such as those shown in FIGS. 14-17may be operatively connected to the torque transmitting member 1328 formanually moving the running board 1302 between the retracted, primaryextended, and secondary extended positions.

The foregoing illustrated embodiments are provided to illustrate thestructural and functional principles of the present invention and arenot intended to be limiting. To the contrary, the principles of thepresent invention are intended to encompass any and all changes,alterations and/or substitutions within the spirit and scope of thefollowing claims.

1. A retractable running board assembly for use with a vehicle having apassenger compartment and a door opening for permitting a person toenter and exit the passenger compartment, the assembly comprising: ananchor constructed and arranged to mount the running board assembly tothe vehicle in an operative position beneath the door opening; anelongated retractable running board; and a running board moving assemblycomprising: at least first and second selectively-actuated linksconnected to the anchor and movably supporting the running board atlongitudinally spaced apart positions, the links being constructed andarranged such that, when the running board assembly is mounted in theoperative position, concerted actuation of each of theselectively-actuated links moves the running board in extending andretracting directions between (a) an extended position wherein therunning board is extended outwardly from the vehicle away from the dooropening at an elevation lower than the door opening and spaced aboveground level for facilitating entry into the passenger compartment viathe door opening and (b) a retracted position wherein the running boardis retracted inwardly and raised upwardly from the extended position,the extending and retracting directions having both vertical andhorizontal components; and a selectively-operable driving mechanismcomprising a transmission having (a) a worm gear to which a drivingforce is applied and (b) a worm wheel meshed with the worm gear andoperatively connected to each of the first and secondselectively-actuated links such that, when the running board assembly ismounted in the operative position, selective operation of the drivingmechanism rotates the worm wheel to concertedly actuate each of theselectively-actuated links to move the running board between theretracted and extended positions; and wherein rotation of the worm gearby the driving force in one direction rotates the worm wheel to move therunning board in the extending direction to the extended position, andin the other direction rotates the worm wheel to move the running boardin the retracting direction to the retracted position; wherein themeshing between the worm gear and the worm wheel prevents a downwardforce applied to the running board from rotating the worm wheel, thuslimiting the running board from being moved by the downward force. 2.The retractable running board assembly according to claim 1, wherein theselectively-actuated links are constructed and arranged such that therunning board moves in an arcuate path between the extended andretracted positions.
 3. The retractable running board assembly accordingto claim 2, wherein the running board has a non-circular cross-sectionperpendicular to a longitudinal direction thereof and wherein theselectively actuated links enable the running board to maintainessentially the same orientation during movement between the extendedand retracted positions.
 4. The retractable running board assemblyaccording to claim 3, wherein the first and second selectively-actuatedlinks each comprise a four-bar mechanism comprising: a first leg definedby the anchor; a second leg connected to the first leg for pivotalmovement about a longitudinal axis relative to the first leg; a thirdleg pivotally connected to the first leg; and a fourth leg pivotallyconnected to the second and third legs, the running board being mountedto the fourth leg.
 5. The retractable running board assembly accordingto claim 4, wherein the running board moving assembly further comprisesan elongated torque transmitting member operatively connecting each ofthe second legs of the first and second selectively-actuated links tothe worm wheel of the selectively-operable driving mechanism'stransmission to transmit torque from the selectively-operable drivingmechanism to pivot the second legs about the longitudinal axis, thuscausing the links to move the running board between the extended andretracted positions.
 6. The retractable running board assembly accordingto claim 1, wherein the first and second selectively-actuated links eachcomprise: a track rigidly mounted to one of the running board and theanchor; and a slider mounted to the other of the running board and theanchor, the slider being connected to the track for guiding relativemovement of the running board between the extended and retractedpositions, wherein actuation of the selectively-operable drivingmechanism controls the relative positions between each slider and eachtrack, thus controlling the position of the running board.
 7. Theretractable running board assembly according to claim 1, furthercomprising an elongated torque transmitting member operativelyconnecting each of the first and second selectively-actuated links tothe worm wheel of the selectively-operable driving mechanism'stransmission such that operation of the selectively-operable drivingmechanism rotates the worm wheel to rotate the torque transmittingmember to concertedly actuate each of the links and move the runningboard between the extended and retracted positions.
 8. The retractablerunning board assembly according to claim 7, wherein the running boardmoving assembly further comprises a flexible torque transmitting cableoperatively connected to the worm gear for transmitting the drivingforce to the worm gear.
 9. The retractable running board assemblyaccording to claim 1, wherein the selectively actuated links areconstructed and arranged such that concerted actuation of theselectively-actuated links also moves the running board between theextended position and a secondary extended position wherein the runningboard is moved upwardly from the extended position for facilitatingpassenger access to a roof of the vehicle.
 10. The retractable runningboard assembly of claim 1, wherein the selectively-operable drivingmechanism is manually powered and has a manually operated inputoperatively connected to the worm gear.
 11. The retractable runningboard assembly of claim 1, wherein the selectively-operable drivingmechanism is power-operated and comprises a motor operatively connectedto the worm gear.
 12. The retractable running board assembly accordingto claim 1, wherein the vehicle includes an additional door opening andthe running board assembly further comprises an additional elongatedretractable running board, wherein the running board moving assemblyfurther comprises third and fourth selectively-actuated links eachhaving an end portion connected to the anchor and movably supporting theadditional running board at longitudinally spaced apart positions, thethird and fourth links being constructed and arranged such that, whenthe running board assembly is mounted in the operative position,concerted actuation of each of the third and fourth links moves theadditional running board in extending and retracting directions between(a) an extended position wherein the additional running board isextended outwardly from the vehicle away form the opening at anelevation lower than the opening of the passenger compartment and spacedabove ground level for facilitating passenger entry into the passengercompartment via the additional door opening and (b) a retracted positionwherein the additional running board is retracted inwardly and raisedupwardly from the extended position, the extending and retractingdirections of the additional running board having both vertical andhorizontal components and wherein the selectively-operable drivingmechanism further comprises a second transmission having (a) a worm gearto which a driving force is applied, and (b) a worm wheel meshed withthe worm gear and operatively connected to each of the third and fourthselectively-actuated links such that, when the running board assembly ismounted in the operative position, selective operation of the drivingmechanism rotates the worm wheel of the second transmission toconcertedly actuate each of the third and fourth selectively-actuatedlinks to move the additional running board between the retracted andextended positions; wherein rotation of the second transmission's wormgear by the driving force in one direction rotates the worm wheel tomove the additional running board in the extending direction to theextended position, and in the other direction rotates the worm wheel tomove the additional running board in the retracting direction to theretracted position; wherein the meshing between the worm gear and theworm wheel of the second transmission prevents a downward force appliedto the additional running board from rotating the worm wheel, thuslimiting the additional running board from being moved by the downwardforce.
 13. The retractable running board assembly according to claim 12,wherein the running board moving assembly further comprises: a firstelongated torque transmitting member operatively connecting each of thefirst and second selectively-actuated links to the worm wheel of thetransmission; and a second elongated torque transmitting memberoperatively connecting each of the third and fourth selectively-actuatedlinks to the worm wheel of the second transmission, wherein operation ofthe selectively-operable driving mechanism rotates the worm wheels torotate the first and second torque transmitting members to concertedlyactuate each of the links and move the running boards between theextended and retracted positions.
 14. The retractable running boardassembly according to claim 13, wherein the running board movingassembly further comprises: first and second flexible torquetransmitting cables operatively connected to each of the worm gears fortransmitting driving force to the worm gears.
 15. A method of operatinga retractable running board assembly on a vehicle, the vehiclecomprising a passenger compartment having a door opening for permittinga person to enter and exit the passenger compartment, the retractablerunning board assembly being mounted to the vehicle in an operativeposition beneath the door opening, the retractable running boardassembly comprising an elongated retractable running board, first andsecond selectively-actuated links connected to the anchor and movablysupporting the running board at longitudinally spaced apart positions,the links being constructed and arranged such that concerted actuationof each of the links moves the running board between (a) an extendedposition wherein the running board is extended outwardly from thevehicle away from the door opening at an elevation lower than theopening of the passenger compartment and spaced above ground level forfacilitating entry into the passenger compartment via the door opening,and (b) a retracted position wherein the running board is retractedinwardly and raised upwardly from the extended position, the extendingand retracting directions having both vertical and horizontalcomponents, and a selectively-operable driving mechanism comprising atransmission having (a) worm gear to which driving force is applied and(b) as worm wheel meshed with the worm gear and operatively connected toeach of the first and second selectively-actuated links such that theactuation of the driving mechanism rotates the worm wheel to concertedlyactuate each of the selectively-actuated links, the method comprising:selectively operating the driving mechanism to rotate the worm wheel toconcertedly actuate the first and second selectively-actuated links, andthereby move the running board both vertically and horizontally betweenthe extended position and the retracted position; wherein the meshingbetween the worm gear and the worm wheel prevents a downward forceapplied to the running board from rotating the worm wheel, thus limitingthe running board from being moved by the downward force.
 16. Aretractable running board assembly for use with a vehicle having apassenger compartment and a door opening for permitting a person toenter and exit the passenger compartment, the assembly comprising: ananchor constructed and arranged to mount the running board assembly tothe vehicle in an operative position beneath the door opening; anelongated retractable running board having a non-circular cross-sectionperpendicular to a longitudinal direction thereof; and a running boardmoving assembly comprising: at least one link connected between therunning board and the anchor and movably supporting the running board,the link being constructed and arranged such that, when the runningboard assembly is mounted to the vehicle in the operative position,actuation of the link moves the running board in an arcuate path inextending and retracting directions between (a) an extended positionwherein the running board is extended outwardly from the vehicle awayfrom the door opening at an elevation lower than the door opening andspaced above ground level for facilitating entry into the passengercompartment via the door opening and (b) a retracted position whereinthe running board is retracted inwardly and raised upwardly from theextended position, the extending and retracting directions having bothvertical and horizontal components, the link enabling the running boardto maintain essentially the same orientation during movement between theextended and retracted positions; and a selectively-operable drivingmechanism comprising a transmission having (a) a worm gear to whichdriving force is applied, and (b) a worm wheel meshed with the worm gearand operatively connected to the link such that, when the running boardassembly is mounted in the operative position, selective operation ofthe driving mechanism rotates the worm wheel to actuate the link to movethe running board between the retracted and extended positions; whereinrotation of the worm gear by the driving force in one direction rotatesthe worm wheel to move the running board in the extending direction tothe extended position, and in the other direction rotates the worm wheelto move the running board in the retracting direction to the retractedposition; wherein the meshing between the worm gear and the worm wheelprevents a downward force applied to the running board from rotating theworm wheel, thus limiting the running board from being moved by thedownward force.
 17. The retractable running board assembly according toclaim 16, wherein at least one selectively-actuated link includes atleast first and second selectively-actuated links movably supporting therunning board at longitudinally spaced apart positions.
 18. Theretractable running board assembly according to claim 16, wherein thefirst and second selectively-actuated links each comprise a four-barmechanism comprising: a first leg defined by the anchor; a second legconnected to the first leg for pivotal movement about a longitudinalaxis relative to the first leg; a third leg pivotally connected to thefirst leg; and a fourth leg pivotally connected to the second and thirdlegs, the running board being mounted to the fourth leg.
 19. Theretractable running board assembly to claim 17, wherein the worm wheelof the selectively-operable driving mechanism's transmission isoperatively connected to each of the first and secondselectively-actuated links such that, when the running board assembly ismounted in the operative position, selective operation of the drivingmechanism rotates the worm wheel to concertedly actuate each of theselectively actuated links to move the running board between theretracted and extended positions.
 20. The retractable running boardassembly according to claim 18, wherein the running board movingassembly further comprises an elongated torque transmitting memberoperatively connecting each of the second legs of the first and secondselectively-actuated links to the worm wheel of the selectively-operabledriving mechanism's transmission to transmit torque from theselectively-operable driving mechanism to pivot the second legs aboutthe longitudinal axis, thus causing the links to move the running boardbetween the extended and retracted positions.
 21. The retractablerunning board assembly according to claim 16, wherein the at least oneselectively-actuated link is constructed and arranged such that, whenthe running board assembly is mounted to the vehicle in the operativeposition, actuation of the link moves the running board between (a) theretracted position, (b) the extended position, and (c) a secondaryextended position wherein the running board is moved upwardly from theprimary extended position for facilitating passenger access to a roof ofthe vehicle.
 22. The retractable running board assembly according toclaim 16, wherein the vehicle includes an additional door opening andthe running board assembly further comprises an additional elongatedretractable running board having a non-circular cross-sectionperpendicular to a longitudinal direction thereof; wherein the runningboard moving assembly further comprises at least one additionalselectively-actuated link connected between the additional running boardand the anchor and movably supporting the additional running board, thelink being constructed and arranged such that, when the running boardassembly is mounted to the vehicle in the operative position, actuationof the additional link moves the additional running board in extendingand retracting directions between (a) a retracted position, (b) anextended position wherein the running board is moved at least outwardlywith respect to the vehicle from the retracted position for facilitatingpassenger entry into the passenger compartment via the additional dooropening, the extending and retracting directions of the additionalrunning board having both vertical and horizontal components, theadditional link enabling the additional running board to maintainessentially the same orientation during movement between the extendedand retracted position; and wherein the selectively-operable drivingmechanism further comprises a second transmission having (a) a worm gearto which a driving force is applied, and (b) a worm wheel meshed withthe worm gear and operatively connected to the additional link suchthat, when the running board assembly is mounted in the operativeposition, selective operation of the driving mechanism actuates theadditional link to move additional running board between the retractedand extended positions; wherein rotation of the second transmission'sworm gear by the driving force in one direction rotates the worm wheelto move the additional running board in the extending direction to theextended position, and in the other direction rotates the worm wheel tomove the additional running board in the retracting direction to theretracted position; wherein the meshing between the worm gear and theworm wheel of the second transmission prevents a downward force appliedto the additional running board from rotating the worm wheel, thuslimiting the additional running board from being moved by the downwardforce.
 23. The retractable running board assembly according to claim 22wherein the at least one link includes first and secondselectively-actuated links connected to the anchor and movablysupporting the running board at longitudinally spaced positions and theat least one additional link includes third and fourthselectively-actuate links connected to the anchor and movably supportingthe additional running board at longitudinally spaced apart positions.24. The retractable running board assembly according to claim 22,wherein the running board moving assembly further comprises: a firstelongated torque transmitting member operatively connecting each of thefirst and second selectively-actuated links to the worm wheel of thetransmission; and a second elongated torque transmitting memberoperatively connecting each of the third and fourth selectively-actuatedlinks to the worm wheel of the transmission, wherein operation of theselectively-operable driving mechanism rotates worm wheels to rotate thefirst and second torque transmitting members to concertedly actuate eachof the links and move the running boards between the respective extendedand retracted positions.
 25. The retractable running board assemblyaccording to claim 23, wherein the running board moving assembly furthercomprises: first and second flexible torque transmitting cablesoperatively connected to each of the worm gears for transmitting drivingforce to the worm gears.
 26. A method of operating a retractable runningboard assembly on a vehicle, the vehicle having a passenger compartmentand a door opening for permitting a person to enter and exit thepassenger compartment, the running board assembly being mounted to thevehicle in an operative position beneath the door opening, the runningboard assembly comprising an elongated retractable running board havinga non-circular cross-section perpendicular to a longitudinal directionthereof, at least one link connected between the running board and theanchor and movably supporting the running board, the link beingconstructed and arranged such that actuation of the link moves therunning board in an arcuate path in extending and retracting directionsbetween (a) an extended position wherein the running board extendsoutwardly from the vehicle away from the door opening at an elevationlower than the door opening and spaced above ground level forfacilitating entry into the passenger compartment via the door openingand (b) a retracted position wherein the running board is retractedinwardly and raised upwardly from the extended position, the extendingand retracting directions having both vertical and horizontalcomponents, the link enabling the running board to maintain essentiallythe same orientation during movement between the extended and retractedpositions, and a selectively-operable driving mechanism comprising atransmission having (a) a worm gear to which a driving force is appliedand (b) a worm wheel meshed with the worm gear and operatively connectedto the link such that selective operation of the driving mechanismrotates the worm wheel to actuate the link to move the running boardbetween the retracted and extended positions, the method comprising:selectively operating the driving mechanism to rotate the worm wheel toactuate the link and thereby move the running board in the arcuate pathbetween the extended and retracted position; wherein the meshing betweenthe worm gear and the worm wheel prevents a downward force applied tothe running board from rotating the worm wheel, thus limiting therunning board from being moved by the downward force.